The LCD 0802A is a 16-pin alphanumeric liquid crystal display (LCD) module capable of displaying 2 lines of 8 characters each. It is widely used in electronic projects for presenting text-based information such as sensor readings, system status, or user instructions. This module is compatible with most microcontrollers, including Arduino, and is ideal for applications requiring a compact and efficient text display.
This circuit features an A-Star 32U4 Mini microcontroller connected to a 16x2 I2C LCD screen. The microcontroller provides power and ground to the LCD, and communicates with it via the I2C protocol using the A4 (SDA) and A5 (SCL) pins.
Open Project in Cirkit Designer
This circuit interfaces a 20x4 I2C LCD display with a power source and an I2C communication bus. The LCD is powered by a 4.2V supply from a connector and communicates via I2C through another connector, which provides the SCL and SDA lines as well as ground.
Open Project in Cirkit Designer
This circuit features a Nano 3.0 ATmega328P microcontroller connected to a 16x2 I2C LCD display for output. Two pushbuttons, each with a 10k Ohm pull-down resistor, are connected to digital pins D2 and D3 of the microcontroller for input. The LCD and pushbuttons are powered by the 5V output from the microcontroller, and all components share a common ground.
Open Project in Cirkit Designer
This circuit connects an Arduino Leonardo microcontroller to a 16x2 LCD display via an LCM1602 IIC interface module, enabling the display of text on the LCD. The Arduino is programmed to display the messages 'TEST LCD i2C' and 'KelasRobot.com' on the LCD. The IIC module facilitates communication between the Arduino and the LCD using the I2C protocol, simplifying the wiring and pin usage.
Open Project in Cirkit DesignerBelow are the key technical details of the LCD 0802A module:
| Parameter | Value |
|---|---|
| Display Type | Alphanumeric LCD |
| Display Size | 8 characters x 2 lines |
| Operating Voltage | 4.7V to 5.3V |
| Operating Current | ~1.5mA (without backlight) |
| Backlight Voltage | 4.2V to 4.6V |
| Backlight Current | ~15mA |
| Character Size | 5x8 dot matrix |
| Interface Type | Parallel (4-bit or 8-bit) |
| Operating Temperature | -20°C to +70°C |
The LCD 0802A has 16 pins, as described in the table below:
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VSS | Ground (0V) connection |
| 2 | VDD | Power supply (4.7V to 5.3V) |
| 3 | V0 | Contrast adjustment (connect to a potentiometer for contrast control) |
| 4 | RS | Register Select: 0 = Command, 1 = Data |
| 5 | RW | Read/Write: 0 = Write, 1 = Read |
| 6 | E | Enable: Triggers data read/write when transitioning from HIGH to LOW |
| 7 | D0 | Data Bit 0 (used in 8-bit mode only) |
| 8 | D1 | Data Bit 1 (used in 8-bit mode only) |
| 9 | D2 | Data Bit 2 (used in 8-bit mode only) |
| 10 | D3 | Data Bit 3 (used in 8-bit mode only) |
| 11 | D4 | Data Bit 4 (used in both 4-bit and 8-bit modes) |
| 12 | D5 | Data Bit 5 (used in both 4-bit and 8-bit modes) |
| 13 | D6 | Data Bit 6 (used in both 4-bit and 8-bit modes) |
| 14 | D7 | Data Bit 7 (used in both 4-bit and 8-bit modes) |
| 15 | LED+ | Backlight anode (connect to 5V through a current-limiting resistor) |
| 16 | LED- | Backlight cathode (connect to ground) |
The LCD 0802A can be interfaced with a microcontroller using either 4-bit or 8-bit parallel communication. The 4-bit mode is more commonly used as it requires fewer GPIO pins.
Below is a typical wiring configuration for 4-bit mode:
The following code demonstrates how to use the LCD 0802A with an Arduino UNO using the LiquidCrystal library:
#include <LiquidCrystal.h>
// Initialize the library with the pins connected to the LCD
// RS = 7, E = 8, D4 = 9, D5 = 10, D6 = 11, D7 = 12
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
void setup() {
// Set up the LCD's number of columns and rows
lcd.begin(8, 2);
// Print a message to the LCD
lcd.print("Hello,");
lcd.setCursor(0, 1); // Move to the second line
lcd.print("World!");
}
void loop() {
// No actions in the loop for this example
}
By following this documentation, you can effectively integrate the LCD 0802A into your projects and troubleshoot common issues with ease.